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I put some aluminum mesh in the lower grill that I ordered from mcmaster (PN thanks to Will Franssen), keeps the rocks and rubber chunks out, though smaller bugs still make it through. Probably a good thing that it doesn't block too much airflow. My big air/water heat exchanger got a few dents just from one weekend at TWS behind street tired cars.
www.Mcmaster.com
Just search for the PN below, to the left of the price.
The aluminum tends to get that oxidized look so you should paint it first.
I got a section about 8" tall x the width of the opening, then I put it in the sheetmetal brake and put 2" legs on the top and bottom, it kind of goes over the opening and then you can use screws or wire to attach it. The upper grill is wide open on my car but the rocks don't seem to make it up there.
Steel—0.03" Thickness (22 Gauge)
0.25" 79% 0.281" 92725T22 $37.70
Aluminum—0.032" Thickness (20 Gauge)
0.25" 79% 0.281" 92725T42 40.22
www.Mcmaster.com
Just search for the PN below, to the left of the price.
The aluminum tends to get that oxidized look so you should paint it first.
I got a section about 8" tall x the width of the opening, then I put it in the sheetmetal brake and put 2" legs on the top and bottom, it kind of goes over the opening and then you can use screws or wire to attach it. The upper grill is wide open on my car but the rocks don't seem to make it up there.
Steel—0.03" Thickness (22 Gauge)
0.25" 79% 0.281" 92725T22 $37.70
Aluminum—0.032" Thickness (20 Gauge)
0.25" 79% 0.281" 92725T42 40.22